The similarity between juvenile forms of this fish and the preceding two species can be a source of great confusion to the beginner, as the illustrations show. All three fishes have a juvenile patterning of white lines on a radiant blue background. The following points may help the beginner to be certain of which species he is buying in the absence of expert advice from a dealer. In the Koran Angelfish the white stripes are slightly curved or shaped, but they are much more curved with one near the tail forming a completely closed ellipse in the Emperor Angelfish. In the Bluering Angelfish the white stripes are almost straight, only the ends curving inward slightly towards the tail.